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Frosted finish to Black Onyx

Hi Folks,

I have a pair of earrings a customer asked me to update for her. One
of the stones is matte black onyx, flat on the top. Since the finish
is showing signs of wear, I’d like to know if there is a way to
refinish it.

My experience in working with glass tells me that when something is
sandblasted, or a rough finished surface, the surface needs to be
sealed to keep finger prints from showing when handled. In glass
that would be an acid bath.

My question: How do I give these black onyx stones a new frosted
finish, then seal the surface when I’m done? Thanks in advance for
all your help.

Jenny Levernier
jmml designs
Minneapolis, MN